// -------------------------------------------------------------------

// Switch Content Script- By Dynamic Drive, available at: http://www.dynamicdrive.com

// Created: Jan 5th, 2007

// April 5th, 07: Added ability to persist content states by x days versus just session only

// March 27th, 08': Added ability for certain headers to get its contents remotely from an external file via Ajax (2 variables below to customize)

// -------------------------------------------------------------------



var switchcontent_ajax_msg='<em>Loading Ajax content...</em>' //Customize message to show while fetching Ajax content (if applicable)

var switchcontent_ajax_bustcache=true //Bust cache and refresh fetched Ajax contents when page is reloaded/ viewed again?



function switchcontent(className, filtertag){

        this.className=className

        this.collapsePrev=false //Default: Collapse previous content each time

        this.persistType="none" //Default: Disable persistence

        //Limit type of element to scan for on page for switch contents if 2nd function parameter is defined, for efficiency sake (ie: "div")

        this.filter_content_tag=(typeof filtertag!="undefined")? filtertag.toLowerCase() : ""

        this.ajaxheaders={} //object to hold path to ajax content for corresponding header (ie: ajaxheaders["header1"]='external.htm')

}



switchcontent.prototype.setStatus=function(openHTML, closeHTML){ //PUBLIC: Set open/ closing HTML indicator. Optional

        this.statusOpen=openHTML

        this.statusClosed=closeHTML

}



switchcontent.prototype.setColor=function(openColor, closeColor){ //PUBLIC: Set open/ closing color of switch header. Optional

        this.colorOpen=openColor

        this.colorClosed=closeColor

}



switchcontent.prototype.setPersist=function(bool, days){ //PUBLIC: Enable/ disable persistence. Default is false.

        if (bool==true){ //if enable persistence

                if (typeof days=="undefined") //if session only

                        this.persistType="session"

                else{ //else if non session persistent

                        this.persistType="days"

                        this.persistDays=parseInt(days)

                }

        }

        else

                this.persistType="none"

}



switchcontent.prototype.collapsePrevious=function(bool){ //PUBLIC: Enable/ disable collapse previous content. Default is false.

        this.collapsePrev=bool

}



switchcontent.prototype.setContent=function(index, filepath){ //PUBLIC: Set path to ajax content for corresponding header based on header index

        this.ajaxheaders["header"+index]=filepath

}



switchcontent.prototype.sweepToggle=function(setting){ //PUBLIC: Expand/ contract all contents method. (Values: "contract"|"expand")

        if (typeof this.headers!="undefined" && this.headers.length>0){ //if there are switch contents defined on the page

                for (var i=0; i<this.headers.length; i++){

                        if (setting=="expand")

                                this.expandcontent(this.headers[i]) //expand each content

                        else if (setting=="contract")

                                this.contractcontent(this.headers[i]) //contract each content

                }

        }

}





switchcontent.prototype.defaultExpanded=function(){ //PUBLIC: Set contents that should be expanded by default when the page loads (ie: defaultExpanded(0,2,3)). Persistence if enabled overrides this setting.

        var expandedindices=[] //Array to hold indices (position) of content to be expanded by default

        //Loop through function arguments, and store each one within array

        //Two test conditions: 1) End of Arguments array, or 2) If "collapsePrev" is enabled, only the first entered index (as only 1 content can be expanded at any time)

        for (var i=0; (!this.collapsePrev && i<arguments.length) || (this.collapsePrev && i==0); i++)

                expandedindices[expandedindices.length]=arguments[i]

        this.expandedindices=expandedindices.join(",") //convert array into a string of the format: "0,2,3" for later parsing by script

}





//PRIVATE: Sets color of switch header.



switchcontent.prototype.togglecolor=function(header, status){

        if (typeof this.colorOpen!="undefined")

                header.style.color=status

}





//PRIVATE: Sets status indicator HTML of switch header.



switchcontent.prototype.togglestatus=function(header, status){

        if (typeof this.statusOpen!="undefined")

                header.firstChild.innerHTML=status

}





//PRIVATE: Contracts a content based on its corresponding header entered



switchcontent.prototype.contractcontent=function(header){

        var innercontent=document.getElementById(header.id.replace("-title", "")) //Reference content container for this header

        innercontent.style.display="none"

        this.togglestatus(header, this.statusClosed)

        this.togglecolor(header, this.colorClosed)

}





//PRIVATE: Expands a content based on its corresponding header entered



switchcontent.prototype.expandcontent=function(header){

        var innercontent=document.getElementById(header.id.replace("-title", ""))

        if (header.ajaxstatus=="waiting"){//if this is an Ajax header AND remote content hasn't already been fetched

                switchcontent.connect(header.ajaxfile, header)

        }

        innercontent.style.display="block"

        this.togglestatus(header, this.statusOpen)

        this.togglecolor(header, this.colorOpen)

}



// -------------------------------------------------------------------

// PRIVATE: toggledisplay(header)- Toggles between a content being expanded or contracted

// If "Collapse Previous" is enabled, contracts previous open content before expanding current

// -------------------------------------------------------------------



switchcontent.prototype.toggledisplay=function(header){

        var innercontent=document.getElementById(header.id.replace("-title", "")) //Reference content container for this header

        if (innercontent.style.display=="block")

                this.contractcontent(header)

        else{

                this.expandcontent(header)

                if (this.collapsePrev && typeof this.prevHeader!="undefined" && this.prevHeader.id!=header.id) // If "Collapse Previous" is enabled and there's a previous open content

                        this.contractcontent(this.prevHeader) //Contract that content first

        }

        if (this.collapsePrev)

                this.prevHeader=header //Set current expanded content as the next "Previous Content"

}





// -------------------------------------------------------------------

// PRIVATE: collectElementbyClass()- Searches and stores all switch contents (based on shared class name) and their headers in two arrays

// Each content should carry an unique ID, and for its header, an ID equal to "CONTENTID-TITLE"

// -------------------------------------------------------------------



switchcontent.prototype.collectElementbyClass=function(classname){ //Returns an array containing DIVs with specified classname

        var classnameRE=new RegExp("(^|\\s+)"+classname+"($|\\s+)", "i") //regular expression to screen for classname within element

        this.headers=[], this.innercontents=[]

        if (this.filter_content_tag!="") //If user defined limit type of element to scan for to a certain element (ie: "div" only)

                var allelements=document.getElementsByTagName(this.filter_content_tag)

        else //else, scan all elements on the page!

                var allelements=document.all? document.all : document.getElementsByTagName("*")

        for (var i=0; i<allelements.length; i++){

                if (typeof allelements[i].className=="string" && allelements[i].className.search(classnameRE)!=-1){

                        if (document.getElementById(allelements[i].id+"-title")!=null){ //if header exists for this inner content

                                this.headers[this.headers.length]=document.getElementById(allelements[i].id+"-title") //store reference to header intended for this inner content

                                this.innercontents[this.innercontents.length]=allelements[i] //store reference to this inner content

                        }

                }

        }

}





//PRIVATE: init()- Initializes Switch Content function (collapse contents by default unless exception is found)



switchcontent.prototype.init=function(){

        var instanceOf=this

        this.collectElementbyClass(this.className) //Get all headers and its corresponding content based on shared class name of contents

        if (this.headers.length==0) //If no headers are present (no contents to switch), just exit

                return

        //If admin has changed number of days to persist from current cookie records, reset persistence by deleting cookie

        if (this.persistType=="days" && (parseInt(switchcontent.getCookie(this.className+"_dtrack"))!=this.persistDays))

                switchcontent.setCookie(this.className+"_d", "", -1) //delete cookie

        // Get ids of open contents below. Four possible scenerios:

        // 1) Session only persistence is enabled AND corresponding cookie contains a non blank ("") string

        // 2) Regular (in days) persistence is enabled AND corresponding cookie contains a non blank ("") string

        // 3) If there are contents that should be enabled by default (even if persistence is enabled and this IS the first page load)

        // 4) Default to no contents should be expanded on page load ("" value)

        var opencontents_ids=(this.persistType=="session" && switchcontent.getCookie(this.className)!="")? ','+switchcontent.getCookie(this.className)+',' : (this.persistType=="days" && switchcontent.getCookie(this.className+"_d")!="")? ','+switchcontent.getCookie(this.className+"_d")+',' : (this.expandedindices)? ','+this.expandedindices+',' : ""

        for (var i=0; i<this.headers.length; i++){ //BEGIN FOR LOOP

                if (typeof this.ajaxheaders["header"+i]!="undefined"){ //if this is an Ajax header

                        this.headers[i].ajaxstatus='waiting' //two possible statuses: "waiting" and "loaded"

                        this.headers[i].ajaxfile=this.ajaxheaders["header"+i]

                }

                if (typeof this.statusOpen!="undefined") //If open/ closing HTML indicator is enabled/ set

                        this.headers[i].innerHTML='<span class="status"></span>'+this.headers[i].innerHTML //Add a span element to original HTML to store indicator

                if (opencontents_ids.indexOf(','+i+',')!=-1){ //if index "i" exists within cookie string or default-enabled string (i=position of the content to expand)

                        this.expandcontent(this.headers[i]) //Expand each content per stored indices (if ""Collapse Previous" is set, only one content)

                        if (this.collapsePrev) //If "Collapse Previous" set

                        this.prevHeader=this.headers[i]  //Indicate the expanded content's corresponding header as the last clicked on header (for logic purpose)

                }

                else //else if no indices found in stored string

                        this.contractcontent(this.headers[i]) //Contract each content by default

                this.headers[i].onclick=function(){instanceOf.toggledisplay(this)}

        } //END FOR LOOP

        switchcontent.dotask(window, function(){instanceOf.rememberpluscleanup()}, "unload") //Call persistence method onunload

}





// -------------------------------------------------------------------

// PRIVATE: rememberpluscleanup()- Stores the indices of content that are expanded inside session only cookie

// If "Collapse Previous" is enabled, only 1st expanded content index is stored

// -------------------------------------------------------------------



//Function to store index of opened ULs relative to other ULs in Tree into cookie:

switchcontent.prototype.rememberpluscleanup=function(){

        //Define array to hold ids of open content that should be persisted

        //Default to just "none" to account for the case where no contents are open when user leaves the page (and persist that):

        var opencontents=new Array("none")

        for (var i=0; i<this.innercontents.length; i++){

                //If persistence enabled, content in question is expanded, and either "Collapse Previous" is disabled, or if enabled, this is the first expanded content

                if (this.persistType!="none" && this.innercontents[i].style.display=="block" && (!this.collapsePrev || (this.collapsePrev && opencontents.length<2)))

                        opencontents[opencontents.length]=i //save the index of the opened UL (relative to the entire list of ULs) as an array element

                this.headers[i].onclick=null //Cleanup code

        }

        if (opencontents.length>1) //If there exists open content to be persisted

                opencontents.shift() //Boot the "none" value from the array, so all it contains are the ids of the open contents

        if (typeof this.statusOpen!="undefined")

                this.statusOpen=this.statusClosed=null //Cleanup code

        if (this.persistType=="session") //if session only cookie set

                switchcontent.setCookie(this.className, opencontents.join(",")) //populate cookie with indices of open contents: classname=1,2,3,etc

        else if (this.persistType=="days" && typeof this.persistDays=="number"){ //if persistent cookie set instead

                switchcontent.setCookie(this.className+"_d", opencontents.join(","), this.persistDays) //populate cookie with indices of open contents

                switchcontent.setCookie(this.className+"_dtrack", this.persistDays, this.persistDays) //also remember number of days to persist (int)

        }

}





// -------------------------------------------------------------------

// A few utility functions below:

// -------------------------------------------------------------------





switchcontent.dotask=function(target, functionref, tasktype){ //assign a function to execute to an event handler (ie: onunload)

        var tasktype=(window.addEventListener)? tasktype : "on"+tasktype

        if (target.addEventListener)

                target.addEventListener(tasktype, functionref, false)

        else if (target.attachEvent)

                target.attachEvent(tasktype, functionref)

}



switchcontent.connect=function(pageurl, header){

        var page_request = false

        var bustcacheparameter=""

        if (window.ActiveXObject){ //Test for support for ActiveXObject in IE first (as XMLHttpRequest in IE7 is broken)

                try {

                page_request = new ActiveXObject("Msxml2.XMLHTTP")

                }

                catch (e){

                        try{

                        page_request = new ActiveXObject("Microsoft.XMLHTTP")

                        }

                        catch (e){}

                }

        }

        else if (window.XMLHttpRequest) // if Mozilla, Safari etc

                page_request = new XMLHttpRequest()

        else

                return false

        page_request.onreadystatechange=function(){switchcontent.loadpage(page_request, header)}

        if (switchcontent_ajax_bustcache) //if bust caching of external page

                bustcacheparameter=(pageurl.indexOf("?")!=-1)? "&"+new Date().getTime() : "?"+new Date().getTime()

        page_request.open('GET', pageurl+bustcacheparameter, true)

        page_request.send(null)

}



switchcontent.loadpage=function(page_request, header){

        var innercontent=document.getElementById(header.id.replace("-title", "")) //Reference content container for this header

        innercontent.innerHTML=switchcontent_ajax_msg //Display "fetching page message"

        if (page_request.readyState == 4 && (page_request.status==200 || window.location.href.indexOf("http")==-1)){

                innercontent.innerHTML=page_request.responseText

                header.ajaxstatus="loaded"

        }

}



switchcontent.getCookie=function(Name){

        var re=new RegExp(Name+"=[^;]+", "i"); //construct RE to search for target name/value pair

        if (document.cookie.match(re)) //if cookie found

                return document.cookie.match(re)[0].split("=")[1] //return its value

        return ""

}



switchcontent.setCookie=function(name, value, days){

        if (typeof days!="undefined"){ //if set persistent cookie

                var expireDate = new Date()

                var expstring=expireDate.setDate(expireDate.getDate()+days)

                document.cookie = name+"="+value+"; expires="+expireDate.toGMTString()

        }

        else //else if this is a session only cookie

                document.cookie = name+"="+value

}